Preforms come in a multitude of sizes, shapes and colours. They can range from opaque to translucent or transparent, so require different measurement techniques depending on the sample type.

Opaque Preforms are impenetrable by light and are best measured using a Diffuse d/8 Sphere reflectance instrument.

Translucent Preforms allow light to pass through, but only diffusely, so that objects on the other side cannot be clearly distinguished. Both reflective and transmittance measurement modes may work well depending on the translucency of the sample.

Transparent Preforms allow light to pass through with little or no interruption or distortion so that objects on the other side can be clearly seen. These preforms can only be measured using transmission instrumentation.

Additionally, certain metrics and indices such as CIE L*a*b*  Colour, Yellowness, Whiteness, or Haze require the use of specific geometries and specific measurement modes.

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